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Contributors MC had the idea for the study; IL, SM and MR undertook all the measurements; AMcF was responsible for the statistical analyses; IL and CI wrote the first draft; all authors contributed to the final draft.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.